Board Thread:Pokémon Help/@comment-103.252.200.26-20160102172752/@comment-27248965-20170411000734

Yeah, this post is very very very old. Unfortunately we got words from the developers and confirmed that the 80% of Hidden Ability passing is disabled on PBB, in order to preserve the rarity of Hidden Ability Pokemon.

Zen Mode Darmanitan is in, but you will have to evolve Darumaka with Hidden Ability to get it.